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Solution To Quant Teaser- 11

When X runs 1000 m Y runs 900m and Z runs 810m

So ratio of their speed is 100:90:81

So now X has to run 1200 ,Y has to run 1100 and Z has to 1000

So when X runs 1200 Y runs 1080so he is just 20 m far from finish  and Z runs 972 m so he is just 28m away from finish